An i5 with 12GB of ram are both pretty low on speed scale, but you do have SATA SSDs in that rig that the seller added. That helps a lot. On the plus side, 700 bucks for that is a steal. If that rig was handed to me to use, I would do one thing, get that ram maxed out. It's pretty cheap right now and 12GB is not enough. But max ram with the added SSDs and the weaker i5 will work for your needs as you described. It won't handle a 250-track orchestral template with every articulation known to man, lol, but general should be fine. The only reason i5's are not the best for this is because they don't so 2 threads per core like i7s, but the CPU is still one of the fastest parts of the chain. Slowest by far are the hard drives. Mechanical are useless, SATA SSDs are decent and that's what you'll get. The new NVMe SSDs are 10x faster that SATA so THOSE will be the MIDI composer's next huge addition to a speedier DAW, by leaps and bounds.

I wouldn't waste your money, it's probably about 5 years old. Plus, it's an i5 with only 12GB Ram. If you are planning to use the Hollywood stuff, 16GB is a minimum but I would definitely go 32GB along with SSD's for the libraries. I would also get a good audio interface.